Love the SX-900. It's just a fun keyboard.
Like Stephen, I too wish the Parameter Lock could be expanded, especially locking in the assignable control knobs. Not crazy about the new style setup. No separate Country or Ballad Style category is hard to get use to.
My last Yamaha arranger was the PSR-3000 so the SX-900 is a major step up, just a little different, and I'm so glad it's here during this "lock down"
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Larry "Hawk"
♫ 🎹🎹 ♫ SX-900